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  2. Trading Glossary
  3. Lot Size

Lot Size

Lot size is a standardized or platform-defined transaction quantity used to express how many units of an instrument a trade controls.

Defined termReviewed 16 July 2026

Related terms

PipCurrency PairNotional ValuePosition SizingForeign Exchange (Forex)Market Order

Educational risk notice

This material is general education, not personal investment advice or a promise of results. Markets can move beyond planned levels, and losses can exceed expectations when leverage, liquidity, gaps, or operational failures are involved.

Read the full risk disclosure
Trading glossaryReviewed 16 July 2026

Definition

Lot size is a standardized or platform-defined transaction quantity used to express how many units of an instrument a trade controls.

In market context

In foreign exchange, market conventions often describe standard, mini, or micro lots, while other products use contract or share quantities. Lot size combines with price movement and leverage to determine notional exposure and the cash value of a pip. Users should rely on the platform’s displayed units and contract specification because the same label can represent different quantities across instruments.

Source

Use the primary source for fuller regulatory or market context.

CFTC Glossary

Educational risk notice

This material is general education, not personal investment advice or a promise of results. Markets can move beyond planned levels, and losses can exceed expectations when leverage, liquidity, gaps, or operational failures are involved.

Read the full risk disclosure

Related glossary terms

Selected from explicit term relationships and shared tags.

beginner3 min

Pip

A pip is a conventional unit for expressing a currency pair’s price change, commonly the fourth decimal place but dependent on the pair’s quotation.

forex · pricingRead guide
beginner3 min

Currency Pair

A currency pair quotes the value of one currency, the base, in units of another currency, the quote currency, for a foreign-exchange transaction.

forex · marketsRead guide
beginner3 min

Notional Value

Notional value is the reference amount of an instrument or underlying exposure used to calculate a leveraged position’s gains, losses, and obligations.

leverage · riskRead guide
beginner3 min

Position Sizing

Position sizing is the process of selecting trade quantity so potential loss and total exposure remain consistent with predefined account-risk limits.

strategy · riskRead guide